684401913 has 64 divisors (see below), whose sum is σ = 1132096000. Its totient is φ = 405907200.

The previous prime is 684401903. The next prime is 684401959. The reversal of 684401913 is 319104486.

684401913 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 684401913 - 2⁴ = 684401897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (684401903) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1960863 + ... + 1961211.

It is an arithmetic number, because the mean of its divisors is an integer number (17689000).

Almost surely, 2^684401913 is an apocalyptic number.

It is an amenable number.

684401913 is a deficient number, since it is larger than the sum of its proper divisors (447694087).

684401913 is a wasteful number, since it uses less digits than its factorization.

684401913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559 (or 553 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 684401913 is about 26161.0762966664. The cubic root of 684401913 is about 881.2593509193.

The spelling of 684401913 in words is "six hundred eighty-four million, four hundred one thousand, nine hundred thirteen".